Node-RED
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Configuration

The following properties can be used to configure Node-RED.

When running as a normal application, it loads its configuration from a settings file. For more information about the settings file and where it is, read this guide.

When running as an embedded application, the configuration options are passed in the call to RED.init(). However, when run in this mode, certain properties are ignored and are left to the embedding application to implement.

Runtime Configuration

flowFile
the file used to store the flows. Default: flows_<hostname>.json
userDir
the directory to store all user data, such as flow and credential files and all library data. Default: $HOME/.node-red
nodesDir
a directory to search for additional installed nodes. Node-RED searches the nodes directory under the userDir directory. This property allows an additional directory to be searched, so that nodes can be installed outside of the Node-RED install structure. Default: $HOME/.node-red/nodes
uiHost
the interface to listen for connections on. Default: 0.0.0.0 - all IPv4 interfaces.

Standalone only.

uiPort
the port used to serve the editor UI. Default: 1880.

Standalone only.

httpAdminRoot
the root url for the editor UI. If set to false, all admin endpoints are disabled. This includes both API endpoints and the editor UI. To disable just the editor UI, see the disableEditor property below. Default: /
httpAdminAuth
Deprecated: see adminAuth.

enables HTTP Basic Authentication on the editor UI:

httpAdminAuth: {user:"nol", pass:"5f4dcc3b5aa765d61d8327deb882cf99"}

The pass property is the md5 hash of the actual password. The following command can be used to generate the hash:

node -e "console.log(require('crypto').createHash('md5').update('YOUR PASSWORD HERE','utf8').digest('hex'))"

Standalone only.

httpNodeRoot
the root url for nodes that provide HTTP endpoints. If set to false, all node-based HTTP endpoints are disabled. Default: /
httpNodeAuth
enables HTTP Basic Authentication. See httpAdminAuth for format.
httpRoot
this sets the root url for both admin and node endpoints. It overrides the values set by httpAdminRoot and httpNodeRoot.
https
enables https, with the specified options object, as defined here.

Standalone only.

disableEditor
if set to true, prevents the editor UI from being served by the runtime. The admin api endpoints remain active. Default: false.
httpStatic
a local directory from which to serve static web content from. This content is served from the top level url, /. When this property is used, httpAdminRoot must also be used to make editor UI available at a path other than /.

Standalone only.

httpStaticAuth
enabled HTTP Basic Authentication on the static content. See httpAdminAuth for format.
httpNodeCors
enables cross-origin resource sharing for the nodes that provide HTTP endpoints, as defined here
httpNodeMiddleware
an HTTP middleware function that is added to all HTTP In nodes. This allows whatever custom processing, such as authentication, is needed for the nodes. The format of the middleware function is documented here. 
httpNodeMiddleware: function(req,res,next) {
    // Perform any processing on the request.
    // Be sure to call next() if the request should be passed
    // to the relevant HTTP In node.
}
logging
currently only console logging is supported. Various levels of logging can be specified. Options are:
  • fatal - only those errors which make the application unusable should be recorded
  • error - record errors which are deemed fatal for a particular request + fatal errors
  • warn - record problems which are non fatal + errors + fatal errors
  • info - record information about the general running of the application + warn + error + fatal errors
  • debug - record information which is more verbose than info + info + warn + error + fatal errors
  • trace - record very detailed logging + debug + info + warn + error + fatal errors

The default level is info. For embedded devices with limited flash storage you may wish to set this to fatal to minimise writes to “disk”.

Editor Configuration

adminAuth
enables user-level security in the editor and admin API. See Securing Node-RED for more information.
paletteCategories
defines the order of categories in the palette. If a node’s category is not in the list, the category will get added to the end of the palette. If not set, the following default order is used: 
['subflows', 'common', 'function', 'network', 'sequence', 'parser', 'storage'],

Note: Until the user creates a subflow the subflow category will be empty and will not be visible in the palette.

Editor Themes

The theme of the editor can be changed by using the following settings object. All parts are optional.

editorTheme: {
    page: {
        title: "Node-RED",
        favicon: "/absolute/path/to/theme/icon",
        css: "/absolute/path/to/custom/css/file",
        scripts: [ "/absolute/path/to/custom/script/file", "/another/script/file"]
    },
    header: {
        title: "Node-RED",
        image: "/absolute/path/to/header/image", // or null to remove image
        url: "http://nodered.org" // optional url to make the header text/image a link to this url
    },
    deployButton: {
        type:"simple",
        label:"Save",
        icon: "/absolute/path/to/deploy/button/image" // or null to remove image
    },
    menu: { // Hide unwanted menu items by id. see packages/node_modules/@node-red/editor-client/src/js/red.js:loadEditor for complete list
        "menu-item-import-library": false,
        "menu-item-export-library": false,
        "menu-item-keyboard-shortcuts": false,
        "menu-item-help": {
            label: "Alternative Help Link Text",
            url: "http://example.com"
        }
    },
    userMenu: false, // Hide the user-menu even if adminAuth is enabled
    login: {
        image: "/absolute/path/to/login/page/big/image" // a 256x256 image
    },
    logout: {
        redirect: "http://example.com"
    },
    palette: {
        editable: true, // Enable/disable the Palette Manager
        catalogues: [   // Alternative palette manager catalogues
            'https://catalogue.nodered.org/catalogue.json'
        ],
        theme: [ // Override node colours - rules test against category/type by RegExp.
            { category: ".*", type: ".*", color: "#f0f" }
        ]
    },
    projects: {
        enabled: false // Enable the projects feature
    }
},

Dashboard

ui
The home path for the Node-RED-Dashboard add-on nodes can specified. This is relative to any already defined httpNodeRoot

ui : { path: “mydashboard” },

Node Configuration

Any node type can define its own settings to be provided in the file.

functionGlobalContext
Function Nodes - a collection of objects to attach to the global function context. For example, 
functionGlobalContext: { osModule:require('os') }

can be accessed in a function node as:

var myos = global.get('osModule');
Note : Prior to Node-RED v0.13, the documented way to use global context was to access it as a sub-property of context: 
context.global.foo = "bar";
 var osModule = context.global.osModule;
This method is still supported, but deprecated in favour of the global.get/global.set functions. This is in anticipation of being able to persist the context data in a future release.
debugMaxLength
Debug Nodes - the maximum length, in characters, of any message sent to the debug sidebar tab. Default: 1000
mqttReconnectTime
MQTT Nodes - if the connection is lost, how long to wait, in milliseconds, before attempting to reconnect. Default: 5000
serialReconnectTime
Serial Nodes - how long to wait, in milliseconds, before attempting to reopen a serial port. Default: 5000
socketReconnectTime
TCP Nodes - how long to wait, in milliseconds, before attempting to reconnect. Default: 10000
socketTimeout
TCP Nodes - how long to wait, in milliseconds, before timing out a socket. Default: 120000

Node-RED: Low-code programming for event-driven applications.

A project of the OpenJS Foundation.